A sales force received some management-by-objectives training. Are the before/after mean scores for salespeople€™s job performance statistically significant at the 0.05 level? The results from the sample of employees are as follows (use your computer and statistical software to solve this problem):

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Skill Carlos Sammy Melanie Philippe Cargill Dwight Amy Kallua Before After 4.84 5.43 5.24 5.51 5.42 4.50 5.90 5.25 5.37 3.69 5.95 4.75 3.90 3.20 4.00 4.50 3.75 Tommy Laurie 5.00 4.50 4.67 Ronald 4.95 4.40 Amanda 4.00 5.95 3.75 Brittany Mathew Alice Jake 3.50 4.00 3.85 5.00 4.10 4.00 5.15